Abstract

An easy to handle dose rate meter has been developed at the Jülich Nuclear Research Centre with a small probe for the energy-independent determination of the dose rate in mixed radiation fields. The dose rate meter contains a small ionisation chamber with a volume of 15.5 cm3. The window of the ionisation chamber consists of an aluminised plastic foil of 7 mg.cm-2. The dose rate meter is suitable for determining the dose rate in skin. With a supplementary depth dose cap, the dose rate can be determined in tissue at a depth of 1 cm. The dose rate meter is energy-independent within ±20% for 147Pm, 204Tl and 90Sr/90Y beta radiation and for gamma radiation in the energy range above 35 keV.

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